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The reason it happen


They kept the methyl isocynate in a Tank. December 2-3 large amounts of water entered tank 610.The reaction with the water increases the temperature up to 200c. This increase the pressure of the tank, it could not cope with the pressure so force the emergency venting of pressure (releasing the pressure) from the MIC holding tank. This released a large amount of toxic gases. The iron in the corroding (breaking down) non-stainless steel pipelines.
Factors of leading to this huge gas leak
.use safer chemicals
. Storing the gases in more tanks
. Corroding materials in pipelines